backend: created user model and authMiddleware

[sethdivyansh]

Description

This PR adds:

• User Model: Created with name and password fields.
• Auth Middleware: JWT authentication middleware.
• User controller: Login and Register user.
• Auth Endpoints: Register and login endpoints.

Fixes: https://github.com/shivansh-bhatnagar18/multiplayer-uno/issues/62

Motivation and Context

This PR is continuation of PR #71

Checklist

• [x] I have tested these changes locally.
• [ ] I have reviewed the code and ensured it follows the project's coding guidelines.
• [ ] I have updated the documentation, if necessary.
• [ ] I have assigned reviewers to this pull request.

Test Screenshots

Register:

Login:

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Name	Status	Preview	Comments	Updated (UTC)
multiplayer-uno	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 8, 2024 9:43pm

[kuv2707]

Looks good to me, thanks @sethdivyansh !